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W25Q16JVSSIQ Datasheet(PDF) 55 Page - Winbond |
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W25Q16JVSSIQ Datasheet(HTML) 55 Page - Winbond |
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55 / 75 page  W25Q16JV Publication Release Date: March 22, 2018, 2018 - 54 - Revision G Read Block/Sector Lock (3Dh) The Individual Block/Sector Lock provides an alternative way to protect the memory array from adverse Erase/Program. In order to use the Individual Block/Sector Locks, the WPS bit in Status Register-3 must be set to 1. If WPS=0, the write protection will be determined by the combination of CMP, SEC, TB, BP[2:0] bits in the Status Registers. The Individual Block/Sector Lock bits are volatile bits. The default values after device power up or after a Reset are 1, so the entire memory array is being protected. To read out the lock bit value of a specific block or sector as illustrated in Figure 4d, a Read Block/Sector Lock command must be issued by driving /CS low, shifting the instruction code “3Dh” into the Data Input (DI) pin on the rising edge of CLK, followed by a 24-bit address. The Block/Sector Lock bit value will be shifted out on the DO pin at the falling edge of CLK with most significant bit (MSB) first as shown in Figure 55. If the least significant bit (LSB) is 1, the corresponding block/sector is locked; if LSB=0, the corresponding block/sector is unlocked, Erase/Program operation can be performed. Figure 55. Read Block Lock Instruction /CS CLK DI (IO0) DO (IO1) Mode 0 Mode 3 0 1 2 3 4 5 6 7 Instruction (3Dh) High Impedance 8 9 10 28 29 30 31 32 33 34 35 36 37 38 39 X X X X X X X 0 24-Bit Address 23 22 21 3 2 1 0 Lock Value Out * * = MSB * Mode 0 Mode 3 |
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